Reamer



Aug. 16, 1949. R SCHADE 2,479,136

REAMER Filed June 14, 1945 lieb P Sch/ade y A44-.By A

' "Mmeys Patented Aug. 16, 1949 Leo P. Schade, Washington, D. C.

1945, Serial N0. 599,439

(Cl. 7'1'72)A Application June 14,

1 Claim.

reamer, and so as to obviate interference with nishing by metal fused onthe reamer in the roughing operation. Y

' Other and subordinate objects, also comprehended by my invention,together with the precise nature of my improvements Iand the manifoldadvantages thereof, will be readily understood when the succeedingdescription and claim are read with reference to the drawingaccompanying and Y forming part of this specification.

In said drawings:

Figure 1 is a view in side elevation of a reamer embodying myimprovements,

Figure 2 is a view in front end elevation, and

Figure 3 is a diagrammatic view illustrating the angle of incidence ofthe leading end cutting sections.

Reference being had to the drawing by numerals, my improvements havebeen shown therein as embodied in a stub machine type reamer having theusual shank I for insertion in a chuck, or the like, not shown, and ahead 2 of the iluted type comprising longitudinal teeth 3 oblique to theaxis of the head 2. For reasons presently apparent, it is essential tothe practice of my invention that the head 2 be provided with anevennumber of teeth 3, above two, six being shown as preferable.

According to my invention, the teeth 3 are provided with leading endcutting sections the lands of which flare rearwardly, relatively, andare ground longitudinally at diierent angles, as regards the lands ofthev remaining portions of the teeth 3, in alternate teeth relative tointermediate same sides of all the teeth. Because of the def 2lscribed-angles of the lands of the leading end cutting sections 4, 5,the cutting edges 3' extend crosswise of each other in a plane,indicated by the dotted line 6, in Figure 3, which is transverse to saidsections, or, in other Words, the head 2. In the rear of this plane 6,said sections 5 lie outsidefof the orbit of operation of said sections4, whereas, in front of the plane 6, said sections 5 lie within theorbit` of operation of said sections 4. Y

Thus, as will be seen, in operating with the described reamer, theleading end cutting sections 4 will ream rst to rough out a bore, andthe leading end cutting sections 5 will follow with a nishing reamingoperation, enlarging and iin'Y By accomplishing the roughing Y ishingthe bore. operations, in the manner described, wear on the leading endcutting sections 5, that is, the cutting edges 3 thereof, is reduced toa minimum, the roughing operation being performed completely in advanceof finishing. Also, metal fused onto the leading end cutting sections 4,which is to say the cutting edges 3' thereof, cannot be carried to thenished bore which is cut by the leading end cutting sections 5 as a newbore after 'roughing is completed. As will be clear, the

relative difference in the angles of incidence of the leading end.cutting sections 4, 5 may be varied to suit different operatingrequirements, for instance, in Working in diiferent kinds of metals.

As will also be seen, by varying the angles of incidence of the leadingend cutting sections 4. 5, the length of said edges, as represented bythe lines R., F, may be varied to correspondingly vary the length of thecutting edges 3 of the leading end cutting sections 4 in front of theplane 6, and the length of the cutting edges 3 of the leading endcutting sections 5 in the rear of said plane, so as to predetermine theamount of metal to be cut in the roughing and nishing operations,respectively.

The foregoing will, it is believed, sufce to'impart a clearunderstanding of my invention without further explanation.

Manifestly, the invention, as described, is susceptible ofmodicationswithout departing from the inventive concept, and right ishereinreserved rto such modifications as fall within the Scope of' theappended claim.

What I claim is:

A reamer tool comprising a cylindrical body having longitudinalalternate and intermediate cutting teeth spaced circumferentially aroundthe same equidistantly and embodying leading end cutting sectionsinclined rearwardly from the within the orbit of operation of the endcutting sections of alternate teeth.

LEO P. SCHADE.v

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,630,602 Blanco May 31, 19272,063,753 Pamman Dec. 8, 1936

